.loader{
    position:relative;
    margin:0 auto;
    width:300px;
    height:100vh;

    display: -webkit-flex;
    display: -ms-flexbox;
    display: -ms-flex;
    display:flex;

    -webkit-flex-direction:column;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-flex-wrap:nowrap;
    -ms-flex-wrap: nowrap;
    flex-wrap: nowrap;
    -webkit-justify-content:center;
    -ms-justify-content:center;
    justify-content: center;
}

.loading{
    width:300px;
}